taikedz writes: "Some job descriptions I have come across request candidates to have "strong virtualization skills." Aside from knowing how to setup a virtual machine, what other technologies and techniques do you think fall under this subject?"

Meeting one set of expectations gets you hired; meeting the other set keeps you from getting fired.

in many cases they just know virtualization is good (or at least trendy) and want to get some.

There are situations are when they know it's trendy, want to get some, and need to be talked out of it. It's probably beneficial for your reputation if you can recognize those in advance, and opt out if you're not up to the task.